How to trouble-shoot a VDS equipped control system:
First determine if the spa has operated correctly for any amount of time. This tells you 2 things:

1. That the low level programming is correct.
2. That the input power connection is more than likely correct.

Once this has been confirmed you are now able to move on to utilizing the VDS system to get to the root of the problem. On the next slide is a step by step flow chart to assist you in this process. Although the component may be different the steps taken to determine the problem are always the same. The scenario we will be dealing with in this example is:

Main Jet Pump Not Working (Graphic Flowchart) | Conclusion